Roku shares are tumbling this week following their post-IPO rally
https://www.cnbc.com/2017/10/03/roku-ipo-stock-down-a-week-after-ipo.html
Roku's post-IPO honeymoon appears to be over.
Shares of the video streaming company fell 12 percent on Tuesday to $20.81 after dropping more than 11 percent on Monday. The stock has lost 30 percent of its value since reaching a high of $29.80 on Friday.